GS1660 datasheet(49/82 Pages) SEMTECH

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GS1660 HD/SD SDI Receiver

Data Sheet

53834 - 2

September 2012

49 of 82

4.13 Data Format Detection & Indication

In addition to detecting the video standard, the GS1660 detects the data format, i.e. SDTI,

SDI, TDM data (SMPTE 346M), etc.

This information is represented by bits in the DATA_FORMAT_DSX register accessible

through the host interface.

Data format detection is only be carried out when the LOCKED signal is HIGH.

By default (at power up or after system reset), the DATA_FORMAT_DSX register is set to

Fh (undefined). This register is also set as undefined when the LOCKED signal is LOW

and/or the SMPTE_BYPASS pin is LOW.

The data format is determined using the following criteria:

• If TRS ID words are detected but no SDTI header or TDM header is detected, then

the data format is SDI

• If TRS ID words are detected and the SDTI header is available then the format is

SDTI

• If TRS ID words are detected and the TDM data header is detected then the format is

TDM video

• No TRS words are detected, but the PLL is locked, then the data format is unknown

NOTE:

Two data format sets are provided for HD video rates. This is because the Y and

Cr/Cb channels can be used separately to carry SDTI data streams of different data

formats. In SD video mode, only the Y data format register contains the data, and the C

Table 4-11: Data Format Register Codes

YDATA_FORMAT[3:0] or

CDATA_FORMAT[3:0]

Data Format

Remarks

0h ~ 05h

SDTI

SMPTE 321M, SMPTE 322M,

SMPTE 326M

SDI

−

Reserved

−

TDM

SMPTE 346M

HD-SDTI

−

Ah ~ Eh

Reserved

−

Non-SMPTE data

format

Detected data format is not SMPTE.

SMPTE_BYPASS = LOW

or LOCKED =

LOW

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